I have owned a Central Boiler for 2 years and have experience one, and only one issue, my damper freezes open from drifting snow. I have asked my dealer about the issue and he said that it is the first of its kind he has ever heard of. I have tried unsuccessfully to create a breathable cover for the grill so the snow cannot be blown up into the damper and freeze. Is their a breathable elastic cover that Central Boiler sells that remedies the issue?